There is no specific statement about how many kilometers the four-wheel bearing of a car can run in normal driving. Some cars of the same model have about 60,000 kilometers, the bearings have started to make abnormal noises, and some 80,000 kilometers have started to make abnormal noises. This is only one of the four-wheel bearings, but some cars have no abnormal noises at 150,000 kilometers. Over.
Therefore, the bearing can run tens of thousands to tens of thousands of kilometers, and the problem of bearing damage is generally lack of internal lubrication, and some impurities in the bearing cause abnormal operation of the bearing, resulting in abnormal noise and abnormal wear of the bearing!
Bearings in the same car have different life spans, so the life span of the bearings has a lot to do with the driving environment and driving habits.
Bearing damage is mainly due to lubrication problems, or foreign matter inside. Regardless of whether it is a four-wheel bearing or a transfer case bearing or other bearings, lubrication is required inside, and some impurities are not allowed to enter. Once the lubrication is poor or other impurities enter, it may cause abnormal bearing wear.
Anyway, the wheel bearings of the vehicles I have changed are generally more than 50,000 kilometers, and more are about 80,000 to 120,000 kilometers. It is only a bad one. Others may also be used for 120,000 to 180,000 kilometers, or even more. The high number of kilometers.
Some four-wheel bearings can be maintained and can be filled with grease. Some are maintenance-free. If they are broken, they are broken and need to be replaced.
Generally it can be maintained. If it is well maintained, it will not need to be changed for a long time. If it is maintenance-free, it depends on luck. However, the bearings are generally not broken. Most of them will have a buzzing sound above 100,000 kilometers. The abnormal sound of the bearing is generally the faster the speed, the louder the abnormal sound!
In short, there is no specific statement about the life of the four-wheel bearing. The range of kilometers that can be run is very large, ranging from 50,000 to 200,000 kilometers!
How to install and use wheel hub bearings
The use range and usage of wheel hub bearing units are increasing day by day, and it has now developed to the third generation: the first generation is composed of double row angular contact bearings.
The second generation has a flange for fixing the bearing on the outer raceway. The bearing can be simply sleeved on the axle and fixed with a nut, which makes the maintenance of the car easier.
The third-generation wheel hub bearing unit uses the bearing unit and the anti-lock brake system to cooperate. The hub unit is designed with an inner flange and an outer flange. The inner flange is bolted to the drive shaft, and the outer flange installs the entire bearing together.
In authorized repair shops, there are corresponding special tools for installing wheel bearings for different models.
But for comprehensive maintenance companies, such conditions are often not available. In this case, the worn-out bearings that have just been removed can be used because the dimensions of the old bearings and the new bearings are exactly the same.
(1) Install the circlip on the outside of the steering knuckle to position the new wheel hub bearing.
(2) Use the outer ring of the old hub bearing as a spacer, and press the new hub bearing into the steering knuckle. After the bearing is fully pressed in, install the circlip on the other side in place.
(3) Use the old wheel hub bearing inner ring as a spacer to press the wheel hub into the steering knuckle.
(4) After the installation is complete, turn the hub to check whether it is installed in place and check the oil seal.
Precautions for the use of automobile wheel bearings
In order to ensure maximum safety and reliability, it is recommended that you always check the wheel hub bearings regardless of the age of the vehicle-pay attention to whether the bearings have early warning signs of wear: including any frictional noise during rotation or the suspension of the combined wheel when turning Normal deceleration.
For rear-wheel drive vehicles, it is recommended that the front wheel hub bearings should be lubricated when the vehicle has traveled to 38,000 kilometers. When replacing the brake system, check the bearing and replace the oil seal.
Hearing the noise from the hub bearing part, first of all, it is important to find the location of the noise.
There are many moving parts that may produce noise, and it may also be that some rotating parts come into contact with non-rotating parts. If it is confirmed that the noise is in the bearing, the bearing may be damaged and needs to be replaced.
Because the working conditions of the front wheel hub causing the bearing failure on both sides are similar, even if only one bearing is broken, it is recommended to replace it in pairs.
Wheel hub bearings are more sensitive. In any case, you need to use the right method and the right tools.
In the process of storage, transportation and installation, the bearing components must not be damaged. Some bearings require greater pressure to press in, so special tools are required. Be sure to refer to the automobile manufacturing manual.
The bearing should be installed in a clean and tidy environment. Small particles entering the bearing will also shorten the service life of the bearing. It is very important to maintain a clean environment when replacing bearings.
It is not allowed to hit the bearing with a hammer. Be careful not to drop the bearing on the ground (or similar improper handling).
The condition of the shaft and the bearing housing should also be checked before installation. Even slight abrasion can lead to poor fit and cause early bearing failure.